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Rifles, Reloading, Optics, Equipment
Reloading
Powder Bridging??? Fiftydriver
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<blockquote data-quote="DennisPA" data-source="post: 986518" data-attributes="member: 34463"><p><span style="color: black"><span style="font-family: 'Verdana'">Ok I'm going to bring this thread back from the dead!</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">I'm wondering if I'm running into powder bridging. I have 7mmWSM that I use H4831SC in with great results and single digit ES muzzle velocities. </span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">Now I built my wife a fast twist 220 swift to shoot the 90 grain Bergers. Since I had good luck with H4831SC and it was listed on the powders in the Berger reloading manual I thought I would give it a try. But I'm seeing huge swings in muzzle velocities. I tried 5 loads of 5 shots each and the best ES I got was 21fps and it was a terrible group. The two best sub MoA groups were ES of 52fps and 109fps. Could powder bridging cause such large swings in muzzle velocity?</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">Stats:</span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">Chamber 220 Swift</span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">30" 1:7 twist barrel new only 39 rounds</span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">Remington fired brass</span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">Neck turned, trimmed, chamfered flash holes</span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">H4831SC powder loads from 35g to 38g</span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">90 Berger VLD's</span></span></p></blockquote><p></p>
[QUOTE="DennisPA, post: 986518, member: 34463"] [COLOR=black][FONT=Verdana]Ok I'm going to bring this thread back from the dead![/FONT][/COLOR] [COLOR=black][FONT=Verdana]I'm wondering if I'm running into powder bridging. I have 7mmWSM that I use H4831SC in with great results and single digit ES muzzle velocities. [/FONT][/COLOR] [COLOR=black][FONT=Verdana]Now I built my wife a fast twist 220 swift to shoot the 90 grain Bergers. Since I had good luck with H4831SC and it was listed on the powders in the Berger reloading manual I thought I would give it a try. But I'm seeing huge swings in muzzle velocities. I tried 5 loads of 5 shots each and the best ES I got was 21fps and it was a terrible group. The two best sub MoA groups were ES of 52fps and 109fps. Could powder bridging cause such large swings in muzzle velocity?[/FONT][/COLOR] [COLOR=black][FONT=Verdana]Stats:[/FONT][/COLOR] [COLOR=black][FONT=Verdana]Chamber 220 Swift[/FONT][/COLOR] [COLOR=black][FONT=Verdana]30" 1:7 twist barrel new only 39 rounds[/FONT][/COLOR] [COLOR=black][FONT=Verdana]Remington fired brass[/FONT][/COLOR] [COLOR=black][FONT=Verdana]Neck turned, trimmed, chamfered flash holes[/FONT][/COLOR] [COLOR=black][FONT=Verdana]H4831SC powder loads from 35g to 38g[/FONT][/COLOR] [COLOR=black][FONT=Verdana]90 Berger VLD's[/FONT][/COLOR] [/QUOTE]
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Powder Bridging??? Fiftydriver
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